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3 years ago

8

Which expression is equivalent to the given expression?

1 answer:

Romashka [77]3 years ago

3 0

Step-by-step explanation:

3x-21+4x²-8x+36

4x²-5×+15

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Observe that x and e^x are solutions to the homogeneous equation associated with:

yanalaym [24]

To take advantage of the characteristic solutions $y_1(x)=x$ and $y_2(x)=e^x$ , you can try the method of variation of parameters, where we look for a solution of the form

$y=y_1u_1+y_2u_2$

with the condition that

${u_1}'y_1+{u_2}'y_2=0$

$\implies{u_1}'x+{u_2}'e^x=0$ $(\mathbf 1)$

Then

$y'={y_1}'u_1+y_1{u_1}'+{y_2}'u_2+y_2{u_2}'$

$\implies y'={y_1}'u_1+{y_2}'u_2$

$y''={y_1}''u_1+{y_1}'{u_1}'+{y_2}''u_2+{y_2}'{u_2}'$

Substituting into the ODE gives

$(1-x)({y_1}''u_1+{y_1}'{u_1}'+{y_2}''u_2+{y_2}'{u_2}')+x({y_1}'u_1+{y_2}'u_2)-y_1u_1+y_2u_2=2(x-1)^2e^{-x}$

Since

$y_1=x\implies{y_1}'=1\implies{y_1}''=0$

$y_2=e^x\implies{y_2}'=e^x\implies{y_2}''=e^x$

the above reduces to

$(1-x)({u_1}'+e^x{u_2}')=2(x-1)^2e^{-x}$

${u_1}'+e^x{u_2}'=2(1-x)e^{-x}$ $(\mathbf 2)$

$(\mathbf 1)$ and $(\mathbf 2)$ form a linear system that we can solve for ${u_1}',{u_2}'$ using Cramer's rule:

${u_1}'=\dfrac{W_1(x)}{W(x)},{u_2}'=\dfrac{W_2(x)}{W(x)}$

where $W(x)$ is the Wronskian determinant of the fundamental system and $W_i(x)$ is the same determinant, but with the $i$ -th column replaced with $(0,2(x-1)^2e^{-x})$ .

$W(x)=\begin{vmatrix}x&e^x\\1&e^x\end{vmatrix}=e^x(x-1)$

$W_1(x)=\begin{vmatrix}0&e^x\\2(x-1)^2e^{-x}&e^x\end{vmatrix}=-2(x-1)^2$

$W_2(x)=\begin{vmatrix}x&0\\e^x&2(x-1)^2e^{-x}\end{vmatrix}=2xe^{-x}(x-1)^2$

So we have

${u_1}'=\dfrac{-2(x-1)^2}{e^x(x-1)}\implies u_1=2xe^{-x}$

${u_2}'=\dfrac{2xe^{-x}(x-1)^2}{e^x(x-1)}\implies u_2=-x^2e^{-2x}$

Then the particular solution is

$y_p=2x^2e^{-x}-x^2e^{-x}=x^2e^{-x}$

giving the general solution to the ODE,

$\boxed{y(x)=C_1x+C_2e^x+x^2e^{-x}}$

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4 years ago

Calculate the compound interest on investing $8500 for 3 years at 8% annum

pashok25 [27]

Answer:

2040 compound interest

Step-by-step explanation:

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3 years ago

What is 4-(-37)+(8)-(34) Pls solve brainlliest

Anvisha [2.4K]

Answer:

15

Step-by-step explanation:

First we need to remove the parenthesis

4 + 37 + 8 - (34)

4 + 37 + 8 -34

Add 4 and 37

41 + 8 - 34

Add 41 and 8

49 - 34

Subtract

15

6 0

3 years ago